The primary issue of the protection tube buried pipe is tight waterproof reliability, in addition to have good mechanical strength, high strength steel casing due to the use of welded connections, waterproof sealing performance reliability is very high, in addition, its high temperature performance is Other outer protective tube can not be compared. In areas of high water table, in order to ensure the normal operation of the steam does not affect groundwater buried pipe, the outer protective layer is preferably made of sturdy, sealed steel casing pipe insulation steel jacket 1. coating: protective outer steel to avoid corrosion of steel corrosion and prolong the service life of steel. 2. steel jacket pipe insulation outer jacket pipe: groundwater protection insulation from erosion, supporting the work of the tube and can withstand external loads, to ensure normal operation of the working tube. 3. steel jacket pipe insulation polyurethane foam layer: to ensure that the medium temperature to ensure that the outer surface of the protective tube maintained at room temperature. 4. steel jacket pipe insulation barrier, reflective layer: to ensure that organic foam material does not enter the hard inorganic refractory layer; a reflective layer portion of high temperature heat. 5. The steel jacket pipe insulation inorganic rigid insulation layer: high temperature, to ensure the interface between temperature and the organic insulating layer, to ensure not to be carbonized foam. Steel jacket pipe insulation layer 6. Drag Reduction: to ensure the free movement of expansion and contraction pipe work. 7. steel jacket pipe insulation pipe work: to ensure the normal flow of the transmission medium. Buried pipe insulation steel jacket steel casing (steel jacket) embedded technology is a new technology embedded waterproof, leakproof, impermeability, compression and fully enclosed, is Buried technology in high water table areas The first big breakthrough. It is a combination of the transmission medium pipe, steel pipe anti-corrosion coat and superfine wool padding between the pipe and the jacket is made of steel, but also can be graphite, calcium silicon tile shell filled with polyurethane foam and composite. One is the transmission medium pipe, steel pipe and superfine wool coat anticorrosion filling pipe and the jacket pipe between the combination may also be used graphite, silicon calcium watt bulb filled with polyurethane foam and composite. Steel casing (steel jacket) embedded technology is a waterproof, leakproof laying of new technologies, impermeability, compression and fully enclosed, is a major breakthrough Buried technology used in high water table areas. The primary issue of the protection tube buried pipe is tight waterproof reliability, in addition to have good mechanical strength, high strength steel casing due to the use of welded connections, waterproof sealing performance reliability is very high, in addition, its high temperature performance is Other outer protective tube can not be compared. In areas of high water table, in order to ensure the normal operation of the steam does not affect groundwater buried pipe, the outer protective layer is preferably made of sturdy, sealed steel casing. Second, insulation steel jacket pipe insulation insulation based on a sliding manner divided into: internal and external sliding sliding 1, sliding inside: insulation from the pipe work, silicate, drag reduction layer, porous calcium silicate , insulation, stainless steel fastening strip, aluminum foil reflective layer of polyurethane insulation, jacket pipe, the outer coating composition. 2, the outer sliding: the working pipe insulation, glass wool insulation layer, a reflective layer of aluminum foil, stainless steel fastening tape, slide guide bracket, the air insulation layer, the outer protective pipe, the outer coating composition.